Friction draft-rigging.



C. K. BROOKS. v

FRICTION DRAFT RIGG'ING. APPLICATION HLED APR. 21. 1912.

' Patented May 16, 1916.

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572M; fl -P60111013 1U siren erars rareis rrrcn CHESTER K. BROOKS, OF CLEVELAND, OHIO. ASSIGNOR TO THE NATIONAL MALLEABLE CASTINGS COMPANY, OIE CLEVELAND, OHIO, A CORPORATION OF OHIO.

FRICTION DRAFT-HIGGINS Application filed April 27, 1912.

lb all 1121mm it may concern;

Be it known that I, Cnias'rnn K. Bnooxs, a citizen of the United States, residing at Cleveland, (hiyahoga county, Ohio, have invented a new and useful Friction Draft- Rigging, of which the following is a specification, reference being had to the accompanying drawings, in which- Figure l is a plan, partly in section, of my draft rigging, showing its application to a railroad car; Fig. 2 is an elevation, partly in section; and Figs. 3, 4' and 5 show details thereof.

My invention relates to improvements in friction draft riggings and is particularly designed for use with the heavy cars new in service on the railways.

My improved draft rigging is adapted to absorb and to dissipate to a very high degree the shocks of bailing and draft, by reason of the frictional engagement of its parts.

teferring to the drawings-2 indicates a casing or housing, preferably cylindrical in form; the casing or housing 2 has enlarged portions 3 preferably formed integral therewith, which are rectangular in shape and the rear one of which is adapted to abut against the rear draft sill stops l which are attached to the draft sills 5 of the car structure. ing 2 are the springs 6 and 7 the spring 7 being located within spring 6, and both of which abut at their rear ends against the rear end of the casing 2. The frictional elements are composed of a series of segments 8, which bear against the interior of the casing. The casing is preferably lined with a hardened steel bushing 9, which is held in the case by the bearing ring 10. The segments 8 are held against the casing by and are seated in the convolutions of a resilient-helical wedging member 11, which has an inclined wedging face 12, which face 12 bears against the corresponding inclined face 13 of the segments.

14 and 15 are bearing blocks which abut against the foremost and rearmost segments 8, and against the front and rear-of the helix 11, respectively/ The outer surfaces of these blocks are flat and the inner surfaces are provided which form bearings for the end segments of the series, and also seats 18 andlt) against which the ends of the helix abut, parallel to the line of draft. The spring 6 abuts against Specification of Letters Patent.

Seated within the rear of the caswith the stop shoulders 16 and 17, I

Patented May 16, 1916.

Serial No. 693,521.

for the helix and prevents its collapse when excessive wedging pressures are applied. On the inside of the sleeve 21 is a bearing 22 against which the forward end of the spring 7 bears.

The operation of the draft rigging is as follows: In buffing, the butting pressure is transmitted to the front follower 20, which is caused to move rearwardly and to enter the casing 2, the rear end of the casing being held ,from rearward movement relative to the car by the rear stops la which are attached to the draft sills 5. The follower 20 transmits this pressure through the hearing block 14 to the helix 11, and by a wedging action from the helix 11 to the segments 8. This pressure is transmitted through all the convolutions of the helix 11 to all of the. series of segments 8. As the helix moves rearwardly within the casing, its rearward movement is resisted by the spring 6 which bears against the rear end of the bearing block 15, and this resistance is transmitted through the helix 11 to the whole series of segments 8, causing a powerful frictional engagement between the exterior surfaces of the segments andthe entire cylindrical surface of the casing, thus exhausting the force of the boiling shock. This frictional en gagement of the segments and the interior surfaces of the casing increases progressively, since, as the helix 11 and segments 8 move rearwardly in the casing, the spring 6 bears with increasing pressure on the bearing block 15, and this pressure'is transmittedthereby to the helix and to the frictional members as described. When the rigging is under draft, the casing Qwill move for. wardly, and as the front follower 20 is held against forward movement by the forward draft sill stops 4', this forward action of the acts as a positive releasing element and releases all the segments 8 except the rearmost segment, from Wedging engagement with its coils and withothe ca 'ing. This releasing action of the helix is supplemented by a spring 7 which drives the sleeve forwardly and with it the front follower which permits the helix'the more readily to relieve itself of the pressure which has been imposed upon it. It will be seen that as there is no Wedging engagement between the for ward faces of the helix and the rear faces of the segments, that there can be no sticking together of these parts when the pressure on the helix has been relieved, especially as the helix itself has the positive releasing action just described. The release of the wedging action between these parts will be practically simultaneous, since all of the convolutions of the helix spread apart, to some slight extent, in a longitudinal direction, as soon as the pressure abates.

It is obvious to those skilled in the art that many changes may be made in the form and arrangement of the various parts which I have described without departing from my invention, since What I claim is: I

1. In a friction draft rigging, a casing having an internal cylindrical bearing surface, frictional members-bearing against the casing, and having their outer faces concentric thereto, and having inclined inner faces,

a helical Wedging member having inclined Wedging and seating surfaces in its exterior convolutions adapted for the seating therein of said segments, a bearin block having on one side seating surfaces or a segment and for said helix, and a spring bearing against the other-side of said bearing block adapted to transmit pressure therethrough to said helix and to said frictional members.

- 2. Ina friction shock-absorbing mechaand having wedging faces, awedge in the form of a helix having wedging faces engaging the wedging faces on the friction shoes, the friction wedge being substantially non-resilient in a radial direction whereby the length of movement of the wedges and friction shoes is substantially equal, and re silient means opposing the movement friction shoes and Wedge.

4. In frictional shock absorbing mechanism, a longitudinally extending friction member, a plurality of friction shoes bearof the Q ing frictionally'against the friction member and movable longitudinally relatively thereto, wedging non-frictional faces on the friction shoes, and a helix having a wedging non-frictional face coacting with the wedging non-frictional faces of the frictional shoes, and means for holding the helix substantially from movement radially, whereby the helix is always held firmly against the Wedging faces of the friction shoes, and resilient means opposing the movement of the friction shoes and wedge. v CHESTER K. BROOKS. Witnesses:

HARRY E. ORR, R. L. LEHMAN. 

